Could you try and have a vet do a fecal float to look for worms and coccidia? Do you have any pictures of how she looks?Is her crop emptying by morning?
Is her comb getting red? Perhaps she is getting ready to lay. She doesn’t need Poultry Cell if she is eating and drinking well. If given more than a few days, it might cause some runny poops. Just keep an eye on her.